76 MANUAL FOR SUGAR GROWERS. 



crushing as possible, and yet not endanger the safety 

 of the mill by straining or breaking it from over- 

 pressure. In the space between the rollers A and 

 C is fixed a bar or plate the trash-turner, or 

 dumb returner, which serves to direct the crushed 

 cane between the rollers B and C. The mass of 

 crushed canes sometimes becomes jammed between 

 the dumb returner and the rollers, leading to stop- 

 page, and sometimes even to breakage, of the mill. 

 Hence efforts are being made to construct mills in 

 which the use of a dumb returner is dispensed with. 

 Other mills are constructed with four or more rollers. 

 Many kinds of mill have been designed, for each of 

 which some special advantage has been claimed. 

 Many of these are simply of the ordinary three- 

 roller type, with various modifications in their con- 

 struction to afford greater strength or security. 



FIG. 9. Diagram of Fletcher-Le Blanc four-roller mill. 



Among those calling for special comment may be 

 mentioned Fletcher & Le Blanc's four-roller mill, 

 in which the cane is submitted to three crush- 

 ings, as will be seen from the diagram, Fig. 9. 



